mail1.tiggee.com has no NS records.
NS records for this zone are defined at tiggee.com.
NS records for this zone are defined at tiggee.com.
Question and response
Question
dig mail1.tiggee.com. NS
Answer
The response has no answer records.
Authority
tiggee.com. 180 SOA ns11.constellix.com. dns.constellix.com. 2015010127 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0